diff --git a/src/fsfw/timemanager/TimeStamperIF.h b/src/fsfw/timemanager/TimeStamperIF.h
index 2f0e80218..df680b6cf 100644
--- a/src/fsfw/timemanager/TimeStamperIF.h
+++ b/src/fsfw/timemanager/TimeStamperIF.h
@@ -22,9 +22,9 @@ class TimeStamperIF : public SerializeIF {
   //! size reserved for timestamps.
   // static const uint8_t MISSION_TIMESTAMP_SIZE = fsfwconfig::FSFW_MISSION_TIMESTAMP_SIZE;
 
-  [[nodiscard]] virtual size_t getTimestampSize() const = 0;
-  virtual ReturnValue_t addTimeStamp(uint8_t* buffer, uint8_t maxSize) = 0;
+  [[nodiscard]] virtual size_t getTimestampSize() const { return getSerializedSize(); }
 
+  virtual ReturnValue_t addTimeStamp(uint8_t* buffer, uint8_t maxSize) = 0;
   ~TimeStamperIF() override = default;
 };
 
diff --git a/src/fsfw/tmtcpacket/pus/tm/PusTmCreator.cpp b/src/fsfw/tmtcpacket/pus/tm/PusTmCreator.cpp
index 22c998c8f..df931dfdb 100644
--- a/src/fsfw/tmtcpacket/pus/tm/PusTmCreator.cpp
+++ b/src/fsfw/tmtcpacket/pus/tm/PusTmCreator.cpp
@@ -5,15 +5,12 @@
 #include "fsfw/globalfunctions/CRC.h"
 #include "fsfw/timemanager/TimeStamperIF.h"
 
-PusTmCreator::PusTmCreator(SpacePacketParams initSpParams, PusTmParams initPusParams,
-                           TimeStamperIF* timeStamper)
-    : pusParams(initPusParams), spCreator(std::move(initSpParams)) {}
-
-PusTmCreator::PusTmCreator(TimeStamperIF* timeStamper_) {
-  pusParams.secHeader.timeStamper = timeStamper_;
+PusTmCreator::PusTmCreator(SpacePacketParams initSpParams, PusTmParams initPusParams)
+    : pusParams(initPusParams), spCreator(std::move(initSpParams)) {
+  setup();
 }
 
-PusTmCreator::PusTmCreator() = default;
+PusTmCreator::PusTmCreator() { setup(); }
 
 uint16_t PusTmCreator::getPacketIdRaw() const { return spCreator.getPacketIdRaw(); }
 uint16_t PusTmCreator::getPacketSeqCtrlRaw() const { return spCreator.getPacketSeqCtrlRaw(); }
@@ -31,6 +28,7 @@ uint16_t PusTmCreator::getDestId() { return 0; }
 
 ReturnValue_t PusTmCreator::serialize(uint8_t** buffer, size_t* size, size_t maxSize,
                                       SerializeIF::Endianness streamEndianness) const {
+  const uint8_t* start = *buffer;
   if (*size + getSerializedSize() > maxSize) {
     return SerializeIF::BUFFER_TOO_SHORT;
   }
@@ -74,7 +72,7 @@ ReturnValue_t PusTmCreator::serialize(uint8_t** buffer, size_t* size, size_t max
       return result;
     }
   }
-  uint16_t crc16 = CRC::crc16ccitt(*buffer, getFullPacketLen() - sizeof(ecss::PusChecksumT));
+  uint16_t crc16 = CRC::crc16ccitt(start, getFullPacketLen() - sizeof(ecss::PusChecksumT));
   return SerializeAdapter::serialize(&crc16, buffer, size, maxSize, streamEndianness);
 }
 
@@ -85,15 +83,25 @@ ReturnValue_t PusTmCreator::deSerialize(const uint8_t** buffer, size_t* size,
 }
 
 ecss::DataWrapper& PusTmCreator::getDataWrapper() { return pusParams.dataWrapper; }
-TimeStamperIF* PusTmCreator::getTimestamper() { return pusParams.secHeader.timeStamper; }
+TimeStamperIF* PusTmCreator::getTimestamper() const { return pusParams.secHeader.timeStamper; }
 SpacePacketParams& PusTmCreator::getSpParams() { return spCreator.getParams(); }
 
 void PusTmCreator::updateSpLengthField() {
-  size_t headerLen = PusTmIF::MIN_SIZE;
+  size_t headerLen = PusTmIF::MIN_SEC_HEADER_LEN + pusParams.dataWrapper.getLength() +
+                     sizeof(ecss::PusChecksumT) - 1;
   if (pusParams.secHeader.timeStamper != nullptr) {
     headerLen += pusParams.secHeader.timeStamper->getSerializedSize();
   }
-  spCreator.setDataLen(headerLen + pusParams.dataWrapper.getLength() + 1);
+  spCreator.setDataLen(headerLen);
 }
 
 void PusTmCreator::setApid(uint16_t apid) { spCreator.setApid(apid); }
+
+ReturnValue_t PusTmCreator::serialize(uint8_t** buffer, size_t* size, size_t maxSize) const {
+  return serialize(buffer, size, maxSize, SerializeIF::Endianness::NETWORK);
+}
+
+void PusTmCreator::setup() {
+  updateSpLengthField();
+  spCreator.setPacketType(ccsds::PacketType::TM);
+}
diff --git a/src/fsfw/tmtcpacket/pus/tm/PusTmCreator.h b/src/fsfw/tmtcpacket/pus/tm/PusTmCreator.h
index 9ac79d160..97c963915 100644
--- a/src/fsfw/tmtcpacket/pus/tm/PusTmCreator.h
+++ b/src/fsfw/tmtcpacket/pus/tm/PusTmCreator.h
@@ -6,18 +6,35 @@
 #include "fsfw/tmtcpacket/pus/CreatorDataIF.h"
 
 struct PusTmSecHeader {
-  uint8_t pusVersion;
-  uint8_t scTimeRefStatus;
-  uint8_t service;
-  uint8_t subservice;
-  uint16_t messageTypeCounter;
-  uint16_t destId;
-  TimeStamperIF* timeStamper;
+  PusTmSecHeader() = default;
+  PusTmSecHeader(uint8_t service, uint8_t subservice, TimeStamperIF* timeStamper)
+      : service(service), subservice(subservice), timeStamper(timeStamper) {}
+
+  uint8_t service = 0;
+  uint8_t subservice = 0;
+  TimeStamperIF* timeStamper = nullptr;
+  uint8_t pusVersion = ecss::PusVersion::PUS_C;
+  uint8_t scTimeRefStatus = 0;
+  uint16_t messageTypeCounter = 0;
+  uint16_t destId = 0;
 };
 
 struct PusTmParams {
+  PusTmParams() = default;
+  explicit PusTmParams(PusTmSecHeader secHeader) : secHeader(secHeader){};
+  PusTmParams(PusTmSecHeader secHeader, ecss::DataWrapper dataWrapper)
+      : secHeader(secHeader), dataWrapper(dataWrapper) {}
+
+  PusTmParams(uint8_t service, uint8_t subservice, TimeStamperIF* timeStamper)
+      : secHeader(service, subservice, timeStamper) {}
+
+  PusTmParams(uint8_t service, uint8_t subservice, TimeStamperIF* timeStamper,
+              ecss::DataWrapper dataWrapper_)
+      : PusTmParams(service, subservice, timeStamper) {
+    dataWrapper = dataWrapper_;
+  }
   PusTmSecHeader secHeader;
-  ecss::DataWrapper dataWrapper;
+  ecss::DataWrapper dataWrapper{};
 };
 
 class TimeStamperIF;
@@ -25,10 +42,7 @@ class TimeStamperIF;
 class PusTmCreator : public SerializeIF, public PusTmIF, public CreatorDataIF {
  public:
   PusTmCreator();
-
-  explicit PusTmCreator(TimeStamperIF* timeStamper);
-  PusTmCreator(SpacePacketParams initSpParams, PusTmParams initPusParams,
-               TimeStamperIF* timeStamper);
+  PusTmCreator(SpacePacketParams initSpParams, PusTmParams initPusParams);
   ~PusTmCreator() override = default;
 
   void setTimeStamper(TimeStamperIF* timeStamper);
@@ -45,17 +59,19 @@ class PusTmCreator : public SerializeIF, public PusTmIF, public CreatorDataIF {
   uint8_t getScTimeRefStatus() override;
   uint16_t getMessageTypeCounter() override;
   uint16_t getDestId() override;
+  ReturnValue_t serialize(uint8_t** buffer, size_t* size, size_t maxSize) const;
   ReturnValue_t serialize(uint8_t** buffer, size_t* size, size_t maxSize,
                           Endianness streamEndianness) const override;
   [[nodiscard]] size_t getSerializedSize() const override;
   ReturnValue_t deSerialize(const uint8_t** buffer, size_t* size,
                             Endianness streamEndianness) override;
-  TimeStamperIF* getTimestamper();
+  [[nodiscard]] TimeStamperIF* getTimestamper() const;
 
  private:
   ecss::DataWrapper& getDataWrapper() override;
 
  private:
+  void setup();
   PusTmParams pusParams{};
   SpacePacketCreator spCreator;
 };
diff --git a/src/fsfw/tmtcservices/TmStoreHelper.cpp b/src/fsfw/tmtcservices/TmStoreHelper.cpp
index 661ee3a03..44b2e6a19 100644
--- a/src/fsfw/tmtcservices/TmStoreHelper.cpp
+++ b/src/fsfw/tmtcservices/TmStoreHelper.cpp
@@ -4,12 +4,12 @@
 
 TmStoreHelper::TmStoreHelper(uint16_t defaultApid, StorageManagerIF* tmStore,
                              TimeStamperIF* timeStamper)
-    : creator(timeStamper), tmStore(tmStore) {
+    : tmStore(tmStore) {
   creator.setApid(defaultApid);
+  creator.setTimeStamper(timeStamper);
 }
 
-TmStoreHelper::TmStoreHelper(uint16_t defaultApid, StorageManagerIF* tmStore)
-    : creator(nullptr), tmStore(tmStore) {
+TmStoreHelper::TmStoreHelper(uint16_t defaultApid, StorageManagerIF* tmStore) : tmStore(tmStore) {
   creator.setApid(defaultApid);
 }
 
diff --git a/unittests/mocks/CdsShortTimestamperMock.h b/unittests/mocks/CdsShortTimestamperMock.h
new file mode 100644
index 000000000..779859d03
--- /dev/null
+++ b/unittests/mocks/CdsShortTimestamperMock.h
@@ -0,0 +1,53 @@
+#ifndef FSFW_TESTS_CDSSHORTTIMESTAMPERMOCK_H
+#define FSFW_TESTS_CDSSHORTTIMESTAMPERMOCK_H
+
+#include <array>
+
+#include "fsfw/timemanager/TimeStamperIF.h"
+
+class CdsShortTimestamperMock : public TimeStamperIF {
+ public:
+  unsigned int serializeCallCount = 0;
+  ReturnValue_t lastSerializeResult = HasReturnvaluesIF::RETURN_OK;
+  unsigned int getSizeCallCount = 0;
+  std::array<uint8_t, 7> valueToStamp{};
+
+  CdsShortTimestamperMock() = default;
+
+  explicit CdsShortTimestamperMock(std::array<uint8_t, 7> valueToStamp)
+      : valueToStamp(valueToStamp) {}
+
+  ReturnValue_t serialize(uint8_t **buffer, size_t *size, size_t maxSize,
+                          Endianness streamEndianness) const override {
+    auto &thisNonConst = const_cast<CdsShortTimestamperMock &>(*this);
+    thisNonConst.serializeCallCount += 1;
+    if (*size + getSerializedSize() > maxSize) {
+      thisNonConst.lastSerializeResult = SerializeIF::BUFFER_TOO_SHORT;
+      return lastSerializeResult;
+    }
+    std::copy(valueToStamp.begin(), valueToStamp.end(), *buffer);
+    thisNonConst.lastSerializeResult = HasReturnvaluesIF::RETURN_OK;
+    *buffer += getSerializedSize();
+    *size += getSerializedSize();
+    return lastSerializeResult;
+  }
+  [[nodiscard]] size_t getSerializedSize() const override {
+    auto &thisNonConst = const_cast<CdsShortTimestamperMock &>(*this);
+    thisNonConst.getSizeCallCount += 1;
+    return valueToStamp.size();
+  }
+  ReturnValue_t deSerialize(const uint8_t **buffer, size_t *size,
+                            Endianness streamEndianness) override {
+    return HasReturnvaluesIF::RETURN_FAILED;
+  }
+  [[nodiscard]] size_t getTimestampSize() const override { return getSerializedSize(); }
+  ReturnValue_t addTimeStamp(uint8_t *buffer, uint8_t maxSize) override { return 0; }
+
+  void reset() {
+    serializeCallCount = 0;
+    getSizeCallCount = 0;
+  }
+
+ private:
+};
+#endif  // FSFW_TESTS_CDSSHORTTIMESTAMPERMOCK_H
diff --git a/unittests/tmtcpacket/testPusTcCreator.cpp b/unittests/tmtcpacket/testPusTcCreator.cpp
index ca9341212..28c7e555d 100644
--- a/unittests/tmtcpacket/testPusTcCreator.cpp
+++ b/unittests/tmtcpacket/testPusTcCreator.cpp
@@ -16,6 +16,7 @@ TEST_CASE("PUS TC Creator", "[pus-tc-creator]") {
   size_t serLen = 0;
 
   SECTION("State") {
+    REQUIRE(creator.isTc());
     REQUIRE(creator.getService() == 17);
     REQUIRE(creator.getSubService() == 1);
     REQUIRE(creator.getApid() == 0x02);
diff --git a/unittests/tmtcpacket/testPusTmCreator.cpp b/unittests/tmtcpacket/testPusTmCreator.cpp
index 481b6a31b..6b92b1347 100644
--- a/unittests/tmtcpacket/testPusTmCreator.cpp
+++ b/unittests/tmtcpacket/testPusTmCreator.cpp
@@ -1,3 +1,65 @@
 #include <catch2/catch_test_macros.hpp>
 
-TEST_CASE("PUS TM Creator", "[pus-tm-creator]") {}
\ No newline at end of file
+#include "fsfw/globalfunctions/arrayprinter.h"
+#include "fsfw/tmtcpacket/pus/tm.h"
+#include "fsfw/globalfunctions/CRC.h"
+#include "mocks/CdsShortTimestamperMock.h"
+
+TEST_CASE("PUS TM Creator", "[pus-tm-creator]") {
+  auto packetId = PacketId(ccsds::PacketType::TC, true, 0xef);
+  auto spParams =
+      SpacePacketParams(packetId, PacketSeqCtrl(ccsds::SequenceFlags::UNSEGMENTED, 22), 0x00);
+  auto timeStamper = CdsShortTimestamperMock();
+  auto pusTmParams = PusTmParams(17, 2, &timeStamper);
+  timeStamper.valueToStamp = {1, 2, 3, 4, 5, 6, 7};
+  PusTmCreator creator(spParams, pusTmParams);
+  std::array<uint8_t, 32> buf{};
+  uint8_t* dataPtr = buf.data();
+  size_t serLen = 0;
+
+  SECTION("State") {
+    REQUIRE(creator.isTm());
+    REQUIRE(creator.getApid() == 0xef);
+    REQUIRE(creator.getService() == 17);
+    REQUIRE(creator.getSubService() == 2);
+    REQUIRE(creator.getTimestamper() == &timeStamper);
+    REQUIRE(creator.getSequenceFlags() == ccsds::SequenceFlags::UNSEGMENTED);
+    REQUIRE(creator.getSequenceCount() == 22);
+    // 6 bytes CCSDS header, 7 bytes secondary header, 7 bytes CDS short timestamp,
+    // 0 bytes application data, 2 bytes CRC
+    REQUIRE(creator.getFullPacketLen() == 22);
+    // As specified in standard, the data length fields is the total size of the packet without
+    // the primary header minus 1
+    REQUIRE(creator.getPacketDataLen() == 15);
+    REQUIRE(timeStamper.getSizeCallCount == 1);
+  }
+
+  SECTION("Serialization") {
+    REQUIRE(creator.serialize(&dataPtr, &serLen, buf.size()) == HasReturnvaluesIF::RETURN_OK);
+    REQUIRE(buf[0] == 0x08);
+    REQUIRE(buf[1] == 0xef);
+    // Unsegmented is the default
+    REQUIRE(buf[2] == 0xc0);
+    REQUIRE(buf[3] == 22);
+    REQUIRE(buf[4] == 0);
+    REQUIRE(buf[5] == 15);
+    REQUIRE(((buf[6] >> 4) & 0b1111) == ecss::PusVersion::PUS_C);
+    // SC time reference field
+    REQUIRE((buf[6] & 0b1111) == 0);
+    // Service and subservice field
+    REQUIRE(buf[7] == 17);
+    REQUIRE(buf[8] == 2);
+    // Message Sequence Count
+    REQUIRE(((buf[9] << 8) | buf[10]) == 0);
+    // Destination ID
+    REQUIRE(((buf[11] << 8) | buf[12]) == 0);
+    // Custom timestamp
+    for(size_t i = 1; i < 8; i++) {
+      REQUIRE(buf[12 + i] == i);
+    }
+    REQUIRE(serLen == 22);
+    REQUIRE(CRC::crc16ccitt(buf.data(), serLen) == 0);
+    REQUIRE(buf[20] == 0x03);
+    REQUIRE(buf[21] == 0x79);
+  }
+}
\ No newline at end of file